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Injection is a powerful inversion of control container that is widely used in the midway framework and brings good user experience.

License: MIT License

JavaScript 0.76% Shell 0.75% TypeScript 98.49%

injection's Introduction

Injection

Injection is a powerful inversion of control container that is widely used in the midway framework and brings good user experience.

Installation

$ npm install injection reflect-metadata --save

Node.js >= 8.0.0 required.

Injection requires TypeScript >= 2.0 and the experimentalDecorators, emitDecoratorMetadata, types and lib compilation options in your tsconfig.json file.

{
  "compilerOptions": {
    "target": "ES2017",
    "lib": ["es2017", "dom"],
    "types": ["reflect-metadata"],
    "module": "commonjs",
    "moduleResolution": "node",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true
  }
}

Getting Started

import {Container, provide, inject} from 'injection';

@provide('userModel')
class UserModel {

}

@provide('userService')
class UserService {
  
  @inject()
  private userModel;
  
  async getUser(uid) {
    // TODO
    return 'Alex';
  }
}


const container = new Container();
container.bind(UserService);
container.bind(UserModel);

async function getData() {
  const userService = await container.getAsync<UserService>('userService'); 
  const data = await userService.getUser(123);
  return data;
}

getData().then(console.log);
// Alex